Ford Mustang 1989-1993 Repair Guide

Brake System Bleeding


See Figures 1, 2 and 3

Click image to see an enlarged view

Fig. Fig. 1: The bleeders may have these protective caps on them. Be sure to replace them to keep dirt out of the bleeder assemblies

Click image to see an enlarged view

Fig. Fig. 2: Bleeding the front caliper

Click image to see an enlarged view

Fig. Fig. 3: Bleeding the rear wheel cylinder

  1. Clean all dirt from the master cylinder.
  3. If the master cylinder is known or suspected to have air in the bore, it must be bled before any of the wheel cylinders or calipers. To bleed the master cylinder, loosen the upper secondary left front outlet fitting approximately 3 / 4 turn. Have an assistant depress the brake pedal slowly through its full travel. Close the outlet fitting and let the pedal return slowly to the fully-released position. Wait five seconds, then repeat the operation until all air bubbles disappear.
  5. Repeat Step 2 with the right-front outlet fitting.
  7. Continue to bleed the brake system by removing the rubber dust cap from the wheel cylinder bleeder fitting or caliper fitting at the right-rear wheel. Place a box-end wrench on the bleeder fitting and attach a rubber drain tube to the fitting. The end of the tube should fit snugly around the fitting. Submerge the other end of the tube in a container partially filled with clean brake fluid. Loosen the fitting 3 / 4 turn.
  9. Have an assistant push the brake pedal down slowly through its full travel. Close the bleeder fitting and allow the pedal to slowly return to its released position. Wait five seconds and repeat the process, continuing until no bubbles appear at the submerged end of the bleeder tube. Secure the bleeder fitting, remove the tube and install the rubber dust cap.
  11. Repeat the procedure in Steps 4 and 5 at the left front, left rear and right front, in this order. Refill the master cylinder reservoir after each wheel cylinder or caliper has been bled; install the master cylinder cover and gasket. When bleeding is completed, the fluid level should be filled to the maximum level indicated on the reservoir.
  13. Always make sure the disc brake pistons are returned to their normal positions by depressing the brake pedal several times until normal pedal travel is established. If the pedal feels spongy, repeat the bleeding procedure.